壁冷叶片冲击射流孔的流动特性实验研究  

Flow Characteristics Measurement in Impingement Hole of Wall-cooling Blade

作　　者：孔满昭[1] 刘海涌[1] 沈天荣[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《流体机械》2005年第10期4-7,14,共5页Fluid Machinery

摘　　要：用实验的方法对涡轮叶片壁面冲击冷却的流动特性进行了研究,并用直头五孔探针对冲击射流孔内的流场进行了详细的测量,着重研究了不同雷诺数和不同的通道高度比(通道高度与射流孔直径之比z/d)对射流孔内流动结构和流量系数的影响。实验结果表明:通道高度的变化会明显改变孔内的流场结构和孔的流量系数;而在同一通道高度下,雷诺数的改变对孔内流场影响相对较小。在射流孔内存在着漩涡结构,这有助于深入了解气膜冷却的内在机理。Experimental results were presented to describe the flow characteristics in impingement hole of wall-cooling blade. Measurement were performed using a straight five-hole probe. The effects of the variations of Reynolds number , height/jet hole diameter ratio （channel high with hole diameter ratio ） on the flow fields and discharge coefficients were studied. Important aspects of the study include： flow characteristic and discharge coefficients of the hole are varied strongly with z/d. Reynolds number does not play the primarily role while comparing to the z/d. There is vortex occurs in the hole, while is helpful to the detailed analysis of film cooling physical mechanisms.

关 键 词：流场结构 流量系数 气膜冷却 五孔探针 射流孔 

分 类 号：TP6[自动化与计算机技术—控制理论与控制工程]